Re: Patch 4/6 randomize the stack pointer

[Christoph Hellwig]

> The patch below replaces the existing 8Kb randomisation of the userspace
> stack pointer (which is currently only done for Hyperthreaded P-IVs) with a
> more general randomisation over a 64Kb range. 64Kb is not a lot, but it's a
> start and once the dust settles we can increase this value to a more
> agressive value.

Why are we doing this for x86 only, btw? 

> +unsigned long arch_align_stack(unsigned long sp)
> +{
> +	if (randomize_va_space)
> +		sp -= ((get_random_int() % 4096) << 4);
> +	return sp & ~0xf;
> +}

this looks like it'd work nicely on all architectures.

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